As far as exercise goes, your best bet is to talk to your doctor to get advice on what activity is safe and what you should avoid. The good news is, the majority of your weight loss progress comes from diet, not exercise. So as long as you're tracking your food consistently and staying in your recommended calorie and nutrient ranges, that's what will help most when it comes to weight loss.
"You may have a fresh start any moment you choose, for this thing that we call "failure" is not the falling down but the staying down." Mary Pickford